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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f759db469bdb02d08668c927d554fe4e12635701ca239fc19a06b880e89ee90a' 
  AND token = 'qzpO2Oc29wiCqFdG+LnZ+9uOUPZDUIcctrdzYkNPvIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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