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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '488dc456ede5fd5bdc50acce1ae9d2b94ab4830a09eee5fcc22c77ab0ebc2aa0' 
  AND token = 'kHPrZQs2Wqk+C+ucXWU2/xx58mV9913CnHLg/5uRZBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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