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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7030f52d54c5f2890e3d9334bed02cc7bb43330479c8e39ccba626c1caacf373' 
  AND token = 'r5v30d3r0HIIPMin/q64L7to9newD8EefSE6Dw39ItA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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