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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc477b9116808da99b50b650003dff0fa0ba26b099e8c18c9b82dcc5c9814d4d' 
  AND token = 'gPrsV2XR9S9OFqTSftVY2gTbqD0P/NmDnU7wabKGs1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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