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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6581b3479259ac9122a5c0c8c4588a6b483aff40170006cbddaaa53f31b3079' 
  AND token = 'mmTXuKV+vM2bbHZXS+6y1c2uLgjKoPeXrxnqAgnC8iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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