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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92f104f6512cd2bda9b87ef5b802aae724745aea0acf73f8b4fe2ad396a9107' 
  AND token = 'bCsFGR58e8kltSu4EfNR/cs1j+H9OHHW1sOCvYwBjZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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