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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21eb05b82d43f0fb486177fb71b18d181f1dbeccb9e8b3b963c3b0e5b02b9b56' 
  AND token = 'QMglvehEHVU4Aim7X2PcbpdzIXVdffHZzxwfNTyMWu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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