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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0eb8c24fb65c232e6510721f653813a79abf9af6677ae5710114351f353aee' 
  AND token = 'zM3I80EWYw2gueRizGUdzKYEvEmHLlW5ftHc2sJ+wXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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