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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da937984c0f0d7fa46bbcbbf2410c04cfc3cec726d8de5bd8454ca0cd0fcae0' 
  AND token = 'UB3hw1sIsJOK6AKIcGAa1MR9BgJ67xkEBQNRii5+exw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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