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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e870971b284b2b498da17f27e63b113d99a4c2bf3f4568fa51e85cb64826bbbd' 
  AND token = 'QQD4ssiLn7ICKKGBUk5f1f+4S2xArLRaVVHfbg20TWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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