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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37589f04ae3a1c982fae4baf37a63801471937bac3d33b74300b4380d9cdcea' 
  AND token = 'iCD4KhboqcrslV3FxUaV5gWMOhUmejnzrd7CuaqEmis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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