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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956949746d9836f8d1680da4ed31fb0341ad150f0c0b55d2cc9fe7be3638237a' 
  AND token = 'Mb/M2r83t/ge89bbfsk6Q8MOle8WRHlupsOKHkq9QWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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