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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9c36c13e9b518628d8d5cc9bd1e9a2f5b659263c316c5806a3194bfbd1e0e3' 
  AND token = 'OnWWRa4+7UVyiM/3PDVcjOyhNLX8RELFBtpCcffqtlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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