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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64001b6b747352a255e88fd4833b152ee4d5ea48fc59b5e5d93d7f56ef2ff1c6' 
  AND token = 'oG+9UrQ8/HwT+Zc8/Zr4u+e2xu7DuMqNHx6qr3f5LTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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