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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a1b6f272b880c0d1aa02d8bfe33749889018bcf78df3bd8a7edb07e1f98261' 
  AND token = 'GAe28lmfAreaoY1jWyv9rSQzaK+7EApPUXVL7QLCLDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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