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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79e9d5e8d467382e7f0047d587539ef463b2c1579f777c3173a2028ddfe3ab35' 
  AND token = 'rak4u/xexC89FkUAR68DGs1tRwlCaHlpy9L1K+WGR6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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