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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec592c05e5e68bb08a6a408d857ba8a8bae4525a9d5fa19d0fc36122eb61b7b' 
  AND token = 'iehR1wwwAUIAbdlUzvl7DijmcVc+1yGNCHjnk4LNC8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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