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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38129413783f82ff79ac08f83e40867306dc358919bf6d82dd073f89609d652' 
  AND token = 'CamH1x9eFrtpZBXEaT2zu4unYdIxRFAZCpn6HPELuyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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