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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f28f227144571fea0e1df35a3a57e1249bbf750911c3a373e082c45d8750cfe' 
  AND token = 'svWnPvRpIS4xKVVvEZSGGPwNMHnmjc+2+C+ka+f4twA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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