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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4296ed26647d1885a7e97e679b3cc5f9c632463a30fad26b3052e8348e0d88c7' 
  AND token = 'KeL+ckIt7Rb7uEZrLE1zzpi2WsiyMKgz4Mr0b8pXXNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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