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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991949ccce85b7540716b861537bf9c7604cd733267ba97a52560c9b8e5a1e57' 
  AND token = '/rFebt6/pxiI/w0rXFaPoWlEFVCwevY3x4s+QrbY4Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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