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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a238bdac9a816b1ba7fb9d9220127c652ab05e828969a4f4a98f0097e72f23e' 
  AND token = 'qxEDlJPtCTONPLpR/UI/2Bedy/8iSV6UJstw6jLnqyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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