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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6debf7ecf906053c8844036662699bf9b364fb59950b4b04932ada09c82186' 
  AND token = '/eezLZMTcpLyHCc8rBW6n+1ysRnuxA576OBHAb8HacY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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