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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6187169a77baa2428b1fe224f09de966920b7937fd735d677f43944d2a9e4b' 
  AND token = 'd6B3xZbTiEDGn+y8Ttuhp5iKswYtSpXuQ6TgLOUkjYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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