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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96db34366fd86cab482c1ba1e50478a60e18dc99cfdc94f6506db8d007ec455e' 
  AND token = '9vK+2n4p6ZHogGFl97bJsOnJxqcs390bqsKUDvQzz7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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