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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ab3c0ef4d5fa9be56ff05ecf3d3b561fd72118a168d5de714712ddd70b7ac3' 
  AND token = 'VFHJK3SfwPiKah4F8BdYldNa0WZN4bEzHAz7g2GQUVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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