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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '741cb2f337f4be12bea3c94cd2226cad94487d5e4568acecd2c1f03e78a86d6a' 
  AND token = 'f7/eavBNXUQ4ZFJHnK+cmZBGmwFBI6Zvo73KS6kL8yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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