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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7696f49d219f07b5cac3aabd28a3b2b08f4426ffad5832ae66d18a8a6e0d102' 
  AND token = '0bZHeH9XdNJLNaK3d+V9DTWf733JOAfljpPut73QOcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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