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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a93892050f6e78e5ec291eaa5bf4409a37b4c39a26f7c03b59eedcbedf5a23' 
  AND token = '7weL6N5xZwefEv9T9cCynWhu0QrMmvkJrSRG3B+ArrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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