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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494317476781ad1511c791cc0e735828eace6f1154af2af3fde35e8b73ecf699' 
  AND token = 'as9F8pyyh3i8Lv8meJUTQRcCBjwGTo3jbGnmrRPhlSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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