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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d5bdcdc56c972df25393420ddf1f9981e636e25dd2bc76454f0deee3b8a934' 
  AND token = 'vx9ddbC+czPkbFKFNLHRIB0S3cM3yzDJbJR4pXXa3xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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