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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f6d757c773dd888d942ea32ea640a0605e3f873406cb1d0d5770ca32822a28' 
  AND token = 'YPa5zXjTXdUJTikMIIhDsV/ijkBLZCOIYsu3qu9IKe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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