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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85794f40edc1cf1ca16d10182e9ab4110cc14e88383b831254b8355a8cd04ca' 
  AND token = '5XvsoUCalI9074tutMw0Pf2lSe8HzilDjJ5iWRAf6js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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