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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9192a1cf2bac096b27ce9ddc41f9d89a30b1592d341030be0e228b71b32f94' 
  AND token = 'dc9KGKDhBYk1K2Q5yQcv8zawJ9UIkuhPX4cWivOfgno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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