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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79fa9b05db6041b9d1808e5faac259b9f7ebe9fe8bcecc0e055d519f2ca4f15f' 
  AND token = '8rt+txCPjaBRvWFMpNXSZthsh2I/X/qu2C6tCdgnBZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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