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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4633d8c21a677ec54e6b725cc673c032f96000067a886c7e1ab56c7eaee507b' 
  AND token = 'WtWM/l31zo1TG9D3DPdS7mXPjd/IV20F8KY6sd4e0QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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