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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46b467a258b28665de2eee8047d58bbda9071171737d8d235ca13cb945e2845' 
  AND token = '4+JvP1NxLK3S7I4m65/v2kC02y0cjhYf7Gfcs3WsNx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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