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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f96f63110675385abe9e25b0060dc24ff51868ac23e8684c2a88915639eacd0' 
  AND token = '/HyHJT/PuISR74XH3kH8jc3ERj8D3OpsHq8X8L+IvVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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