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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '605edb2d9691b4e1aef38027c1773ce744110084bcc659bc6e773679c45967ba' 
  AND token = 'B5/fVokPOLQXeEXHhUSfKWIpsPeNgEztq0Lfy7KmUl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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