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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4621daad50678c8fb95b32349ea41d515ee1b4f2c6186b5f867d82ff98215a85' 
  AND token = 'FibMxOX46t1F0+eAQg2wVyq7j9R35J9rVhh7eojitLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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