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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a864d4202c3935c28bfa79a0ce244551def3b9eaaf48b5fe1c7e3939a10a00' 
  AND token = '/wpOsoqp9f4IWBImUC5A1xXAH2ItYObL2ZKGYUDlElU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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