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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e2ba0afd5a1ec305a91f13696b11a8a8fa22166bf94688a88cc5c8cbb42a53' 
  AND token = 'WXm0p83+L0dU6mC1uI15X1m6zoGRiSBysN2bVpN2u5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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