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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6cfde1b5f4fec0c4efe7f0444e1741322fe85ddf562ec98fe2d604b46841891' 
  AND token = 'vsZIMah8/Rug6Yxb6gK3trs4Jhgs4FVgdsxO8LDhuVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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