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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e847f3f4e0f5a2e92ae887b687aefa1878ea62cf8761bfcb5fd947cbe348554' 
  AND token = 'alTOhjo5lfCRp2ondoIlIBYcVbEkbYrwn687iBwNweM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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