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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f07f38084243680f9c0760e427618281ba36139711bc00175b0b049e297d1d3' 
  AND token = '2LaoXZg0S6pRJmBsc8LBWRZbMnIZGl4fe8CJXhOjUx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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