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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093b5b592e650f30baad4c86237c3473882dd5da52a46100cca50b1759753dc8' 
  AND token = 'WdPPalbbQTZjxgpgffhLP/xoerPCIITX8h0s1YgF0Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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