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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a495d1e2c3cbfd7242caadbc5841b8dd74b49d7e012f3a31f13aaafdade3c5' 
  AND token = 'x9y4M19yJE1//jUcIdbVrZDpkssrMy0fpwCvnjbTeis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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