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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf716cbefba9ab3dc482a44670860aef2aa1b6350ec6e1cf221d5280fdba8d9' 
  AND token = '3vA2DqMlXGD+3uDa/bbGI9rSRk/0mF4qJrbtqAXEU9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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