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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb9ecd06296de9de3d8d9cd7e8704ff4d9ac9186ffa9ca2bb8365d7d8ea3a79' 
  AND token = 'F6D8YnFq+yjWAIuJ29u9u5fF+Wd/9/yxJPU97Z3C9nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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