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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95aeb9ee79503934e6a4f311384e916fe2a28e1f1482223d956dac9f85eb25f4' 
  AND token = 'j7Z6UVWqSTlAO4iMbTgr+hl/O0neRigQp1XBNrW8L0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}