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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866d3b918ab5e6023c896be3e6448e2529bdfd5fda848adb92f8d71618323039' 
  AND token = '1Tpg8L3OnMtQDrVMAO512XdbPe1hFCTaCUCf2hct7fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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