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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027b3eeb079c2dacf6085c6e0d3093a14e43849d3a6faa348c2d3c968ac62823' 
  AND token = 'mwI7NRmOx6e3x2Grmj1DEItUlWMtVspzwmb/kQnw14U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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