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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46994b9ab579dd5b2432ba2feeadfd588c2fffbb6b2509d58087334e8b4f9a99' 
  AND token = 'HKa3ar0fgtSDlAKaLK4UjrsgHwK0czHvPH//G+cpD1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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