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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2030632bc86a9067297e6389e0e27a25d3cdcedd0d5ac55555dc745bfbd829f2' 
  AND token = '8H00BLgwvP593AKExSK/o9CgROUfRyV/u6dyjTbyxig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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