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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c92910b52fdf8d3a2fd02ea68b80c9d824725e1aece439306da8fc48e1fbcac' 
  AND token = 'BQtP9vka6ISbU8V179Irwe3xIY2Y2FzUuPERnJj5+Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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