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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c27717a97e048ac57f83732380571759a8af1c6c29ac046a8782f4990036793' 
  AND token = 'uDmNznnHGtnHdIek2D37UJtzOj9bNRmbcn9X5cxpb2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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