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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '541688491471e695a29a8cf2e7df835a0bce977fbc13ad0b58aa37a51dd38464' 
  AND token = 'TkfBuvjul/YuNNIl9GULerAB0EgqrdG3asNoK1dJ6MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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