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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4dd125fb87c43819e029f9f1d65230b78cd0a7917826890b2dcedd53ac2c9f7' 
  AND token = 'I3JEm+qUi8S+fikxqr2vRImULjGfA+Ny7hQpqRKxotE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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