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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2835a5ad88ef27a6cf24dffc4490b4307623fea7b7170b240cb72b96d75783' 
  AND token = '5N0i3zDukhojcehr4/02OEbG7MdnLgGzJTHa1K6/2c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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