SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1154f4c0acaa0531e2d739700135796386ab39179a998ee1862254771aa4623' 
  AND token = 'VoVdHGYCrqgKKX6H6P+E7/CALv8TJNf1Q/8YmNydsCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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