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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8f52889279f99af497b532f8e57334453ee3f7a0a9664e15cb9a4cb3ad1087' 
  AND token = 'f3rWC1vJYoKs0T8IrMsxBpEnWn/52hGCsU9m76zXidE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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