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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c451e5eb305fcf3d79b67d495dfbe7073931292ac3b5b679f5c109bab641d0' 
  AND token = 'lap15cLxEmbHnamIvgRPxC+i+oZbBhS1DO6z1jfsac8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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