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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b208ef56fb3d43b6e10b9458ab723b289b9f5a70bb2e6d1b20b36d8aba5345d1' 
  AND token = '1l4EqZ8N4MtixjaiEPsIV05wbKIhXoZbXfJcQbdNDWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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