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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1ef6c39b7be9f8bbad9984e9a48ecfcaf66e8fe5359a4be755b63e4c84f795' 
  AND token = 'XuUVh4XSxN+VpyJOGanp6kko56tXh5z80V4FrWgs5IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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