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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a436b77ec48fd50f351c2c147f71ac7e882be4639e9eae359f221988a77f53ea' 
  AND token = 'N6pFRmTtM/9nprJjbFyg/0jmkCh2dkyDlEkOGPINf4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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