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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345ec902af5f05f57124ef53547b8e13f9dcfb8218402da6005ebfa4371cb6e8' 
  AND token = 'l7luhtUiINWeLULHOZjK50Nb1UhoRciNX9eAfsXsdVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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