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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a403f21182d0bd285cf4fb18338fadab5e61f0c4b2650e4b3916a884eb5204d' 
  AND token = 'JwpLu4/XW3oC2beKJq7eSxcHlHReRVOOkAeLta6r210=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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