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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96c1b97ded39b189f954c5a6d31fb4e5c569cbef478c32228adde1a99c5c074' 
  AND token = 'vd98Ac1t176pS3qR5mAeZh0p3fLzKhiltvWM7oi64ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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