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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dbd2e0bf8ef9eedbaaabc1929462842e2b6b389895271ae833d84a2a440e0a3' 
  AND token = 'TJ/TavgD/yUDSx40KHqQrdwminEMRxGfFU+gS95I9U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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