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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35b54bb1eaf898765aa52ffb0ed7136e1546ba242d280365fca2127b8d023c63' 
  AND token = 'gpMi0OkknJOhjlulokGo53ie6HU0g6PuG3fLI2MPCw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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