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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '818c606cd0e975b5f1109db0578bbb2c1c8fb7d1e405b1a6ff9a7d74493df22e' 
  AND token = 'd11EBECo0HZaSzfl2FRIdcv1Dj96rHVzYv01F2ljt/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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