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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ceefea115f38eb3e98ffc1873576ddb3678b6195a4d0af155045160f4178a9f' 
  AND token = 'dk0xYC3V4KxQfRpG1cwh7fPE858iZalj1nHE2xoJVTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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