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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371a83f4c124e144c33e736fb4c9edabb5f0669829b26dedc462e3fbc4c665f9' 
  AND token = 'ZSVmffOc3EmIEhlJLLQrOdous0GS9Z7ege9mvLo0UMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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