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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5cbdd7531a758db5b8fca2e2d054f2ca2dde88371871e27bf978f5eb70ba181' 
  AND token = 'M+grPlP9JaGAN1Ong99onV4hRAKdE6aMLY2vmApAlJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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