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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2477c4c5adef5f3d240629481f05b7c0b11bd5dced087c98c21bd46d93a7a1fe' 
  AND token = 'Rc+yVzWZmnB6of0DKsNX9b7Spfic3P8ND3DnMgtwRqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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