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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951000417e6adc7b8c97d40030a41c248c31e40cf12554e2889d44cf1f734b77' 
  AND token = 'p9/MLfuRPtikzFka0N1IVzVzlCYSGeIsoD3M2lDVUDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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