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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa5c2a7d463ff85f9d4c059150f8f75e734ef8aa5a9a135e8fccaa05faa032d' 
  AND token = 'Zdv0IYGD/wmyrPiJViWyjOdv/QnIo5iGHupnLrzV5JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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